| Bik Construction INC | Benjamin Byong-In Kim | — | (714) 904 2686 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Bill Baxendell General Contractor | Bill Baxendell General Contractor | — | (562) 244 9172 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Bill Gammon General Contractor | Bill Gammon General Contractor | — | (760) 315 1788 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Bill Greer | Bill Greer | — | (714) 334 2966 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Bill Krcelic Electric | William Joseph Jr Krcelic | — | (714) 733 3336 | Electricians | Aliso Viejo · Orange County | — | — |
| Bill M Ritt | Bill M Ritt | — | (714) 522 7341 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Bill Mathes Welding INC | William August Iii Mathes | — | (949) 496 0654 | Other | San Clemente · Orange County | — | — |
| Bill Metzger Plumbing INC | William Sydney Metzger | — | (949) 492 3558 | Other | San Clemente · Orange County | — | — |
| Bill Nelson Electric | William Francis Jr Nelson | — | (949) 874 6109 | Electricians | Dana Point · Orange County | — | — |
| Bill Roberson Construction Services | William Rae Roberson | — | (949) 683 6129 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Bill Sharp Architect And Construction Manager | Billy Joe Sharp | — | (714) 878 0700 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Bill Sherman's Perfection Plumbing Service INC | William Robert Sherman | — | (714) 964 4586 | Other | Huntington Beach · Orange County | — | — |
| Bill Taylor Plumbing | Bill Taylor Plumbing | — | (714) 288 0565 | Other | Orange · Orange County | — | — |
| Bill West Landscaping | Bill West Landscaping | — | (714) 639 7400 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Bill's Pool Supply & Service | William Cornelius Bouman | — | (949) 492 2001 | Pool | San Clemente · Orange County | — | — |
| Bill's Sound & Security | William Robert Boodman | — | (714) 540 9800 | Electricians | Costa Mesa · Orange County | — | — |
| Billy Cantu Electric | Cantu Bill | — | (949) 274 6678 | Electricians | Mission Viejo · Orange County | — | — |
| Billy Len Construction | Billy Binh Len | — | (702) 445 4054 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Bin Choi | Bin Choi | — | (213) 335 8396 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Binggeli Electric INC | Justin Marc Binggeli | — | (714) 749 4919 | Electricians | Brea · Orange County | — | — |
| Binh Le | Binh Le | — | (714) 264 7690 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Binh Van Nguyen DBA Bee Builder | Bee Builder | — | (714) 908 6485 | Electricians | Garden Grove · Orange County | — | — |
| Binnquist Development Incorporated | Bruce Wayne Binnquist | — | (949) 553 1969 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Bint Construction INC | Lucas Nahuel Bint | — | (949) 689 3716 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Bir Construction And Painting Company | Manjit Singh Sagoo | — | (714) 402 1084 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Birch Flooring | Birch Flooring | — | (714) 612 6360 | Other | Fountain Valley · Orange County | — | — |
| Birchwood Builders INC | Stephen Paul Gnadt | — | (714) 342 4814 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Bird-man Roof Corp | Moreno Miguel Barba | — | (714) 768 8161 | Other roofers | Anaheim · Orange County | — | — |
| Biri Electric Corporation | Dean Kenton Biri | — | (562) 244 7238 | HVAC | Seal Beach · Orange County | — | — |
| Bis | Lou Dinh Nguyen | — | (714) 224 9367 | Electricians | Garden Grove · Orange County | — | — |
| Bischof Drapery Workroom INC | Travis Clark Bischof | — | (714) 890 8100 | Other | Stanton · Orange County | — | — |
| Bishop Electric | Robert Charles Bishop | jeff@bishop-electric.com | (714) 943 4689 | Electricians | Westminster · Orange County | — | — |
| Bishop INC | Erinn Melanee Steingold | — | (714) 628 1208 | Other roofers | Orange · Orange County | — | — |
| Bistline Engineering INC | Leonard William Brongo | — | (949) 388 1025 | Other | San Clemente · Orange County | — | — |
| Bitech Construction Company INC | Benjamin Byong-in Kim | bitech@bitechconstruction.com | (714) 521 1477 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Bittan Enterprises INC | Aurelio Bahena | — | (714) 926 9725 | Electricians | Fullerton · Orange County | — | — |
| Bixby Plaza Carpets INC | Tony Mike Jr Ausilio | — | (714) 847 2828 | Other | Huntington Beach · Orange County | — | — |
| Bixell Construction INC | John Yonghyun Cheon | — | (657) 705 8550 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Bizal Hoff Co | Keith Michael Wingett | keith@bizal-hoff.com | (714) 630 5584 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Bizprobuilders Corp | Marianella Castillo | — | (949) 878 0755 | GC, remodel, ADU | Newport Beach · Orange County | — | — |